1,1,3,7,17,41,( )A.89 B.99 C.109 D.1198.

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问题 1,1,3,7,17,41,( )

选项 A.89
B.99
C.109
D.1198.

答案B

解析第一项+第二项×2=第三项,依此类推,17+41x2=(99)。
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